Process for vulcanizing rubber and products obtained thereby



Patented Mar. 19, 1929. UNITED STATES PATENT OFFICE.

MORRIS L. WEISS, OF NEWARK, NEW JERSEY, ASSIGNOR tlO DOVAN CHEMICAL COR- PORATION, OF NEW YORK, N. Y., A CORPORATION ,OF NEW YORK.

PROCESS FOR VULCANIZING RUBBER AND PRODUCTS OBTAINED THEREBY.

No Drawing. Application filed July 25, 1925 Serial No. 46,161.

This invention relates to processes for vulfor example, dialphanaphthyl guanidine, a canizing rubber and similar materials and similar accelerator, has the formula to the products obtained ,thereby and is more particularly directed to acceleration of vuls canization by a class of substituted guanidines. 1

One of-the objects of the invention is to H provide a. material which will efficiently ac- 0= H i v celerate vulcanization of rubber; to provide 3, r I g m a simple process for the use of the material I V and to produce a series of usefuhvulcanized v g, NH' =7 rubberproducts. I I Y I ,v I In. accordance with my invention I have Phenyl xylylguanidine, a similar accelerfound that dimeta xylyl guanidine and simiator, has the formula: 15 lar substances are valuable accelerators vof I I i vulcanization. Nil-O lhis application is a continuation in part s of my cmpcnding application Serial No. C=NH I 490,746, filed August 8, 1921. 4 F 20 My invention accordingly comprises a O NH process for accelerating the vulcanlzatlolnbof I 4 1 w rubber which includes combining ru er with a substituted guanidine having an imid 2 5 13 5 3 if; 3 i a group and two substituting aryl groups, at v I m 25 least one of the aryl groups being disubsti- NH tuted, e. 3., (limeta xylyl guanidine and other substances which will be referred to hereinafter, and vulcanizing the rubber.

In carrying out the process in its preferred form I mix, preferably on the mixing mill in the usual manner, 100 pounds of first latex crepe rubber, 50 pounds of zinc oxide, 3 Di cumyl guanidine, a similar accelerator, pounds of rubber and 0.75 pounds of dimeta has the formula xylyl guanidine. After milling is complete 03mm), the mixture is placed in a mold and heated at 45 pounds per square inch steam pressure NH for forty-five minutes, at the end of which time satisfactory vulcanization has occurred. C=NH I have found that the rubber vulcanized in 6 9: 40 this manner has a tensile strength of 3860 pounds per square inch and an elongated of NH 710 per cent.

The formula for dimeta xylyl guanidine is as follows:

45 CH: CH:

50 OH: OH:

Other related substances which I have em- It will be observed from these formulas 55 ploycd as accelerators have similar formulae, that in at least one of the substituting aryl A lpha napthyl beta phenyl guanidine, a slmilar accelerator has the formula:

eumyl guanidine, and the'expres sion at'lea'st one of the substituting aryl groups being di substituted is intended to refer to either.

disubstitution in the ring or in the side chain.

Each of the above aceeleratorsmay-zbe substituted in place of dimeta Xylyl guanidine in the example given. Upon treatment' under the conditions there set-forth, satisfactory vulcanization, similar; to that obtained with dimeta xylyl guanidine, occurs.

It will be understoodthatother vulcanizing agents than elemental sulphur may be employed. Zinc oxide may be omitted in carrying out the process and vulcanization may be. obtained with dimeta xyl 1 guanidine and sulphur, but both theaooe eration of vulcanization and the properties ef'the resulting product are improvedby the presence of zinc oxide or equivalent metallic compoun'rlw i As many apparently widely 'dilerent em bodiments of this invention may be made, I do not wish to beunderstood as being.limited to the details of the steps of the process or compositions herein set forth for various changes may be made therein, without departing from the spirit and scope of my invention, as set forth in the appended claims. \Vhatl claim is ,1. 1. A process for accelerating the v-ulcaniza tion of rubber which comprises combining the rubber with a substituted guanidine having an imid group and having two hydro carbon substituting aryl groups, at least one of the aryl groups-beingdisubstituted, and vulcanizing the rubber.

2. A process for accelerating the vulcaniza- 'zincoxide or a similar substance of an equal valency, and 'vuleanizi-ng the rubber.

4. As a new product, a vulcanized rubber derived from rubber combined witha-substituted guanid ine having an imid group and having two' hydrocarbon substituting aryl gmqispat-deast one of the aryl groups being disubstituted.

5. As a new product, a Vulcanized rubber -derived from'r'ubber combined with a substituted guanidine having/an imid group and having two hydrocarbon substituting aryl groups, at least one of the aryl groups being disubstituted in the ring.

6. A' vulcanized rubber obtained from a rubber compound rontaining a substituted guanidine having an imid group and having two hydrocarbonsubstituting aryl groups, at least one ofthe' aryl groups being disubstituted', sulphur or an equivalent vulcanizing agentand 'zin'c 'oxide or a similar substance having an equal valency 7. *The process of vulcanizi-ng rubber in the presence of a (1i xylyl guanidine.

Signed at New York, N. Y., this 23d day of July, 1925.

. l v M O RRIS L. WVEISS.

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